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sprinkler comes on when not programmed

My sprinkler system comes on when it is not programmed. It is a two zone. The valves on both and solenoid were replaced. I also switched the timer. Everyone tells me it's the timer. I replaced it and it still goes on at non programmed hours. No the wires in the timer are not touching. The timer is set right. I don't know how to fix it. Thank you for any information. I have had many sprinkler people over and they think what it said is not the truth.

I have been using orbit 6 station dual program model 57196. This is a new timer. With this one the sprinkler comes on a lot when not scheduled. Also using optima pc306. This is old but was working. Lastly I was connecting rain bird isa 406. While connecting the common wire and zone 1 this zone came on when it was not supposed to. I was only putting the wires to the timer. Again I have not programmed the timer for more than one time. It just comes on. Any information would be really helpful. Thank you Keith